<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      body {
        margin: 0;
      }
      #wrap {
        margin: 20vh auto;
        width: 260px;
        height: 50vh;
        border: 1px solid #000;
      }
      #list {
        margin: 0;
        padding: 10px 5px;
        list-style: none;
        font: 16px / 2 "宋体";
      }
      #list li {
        border-bottom: 1px solid #000;
      }
    </style>
  </head>
  <body>
    <div id="wrap">
      <ul id="list"></ul>
    </div>
    <script>
      let list = document.querySelector("#list");
      list.innerHTML = [...(".".repeat(100))].map((item,index)=>`<li>这是第${index}个li</li>?`).join("");
      </script>
    <script>
      let list = document.querySelector("#list");
      let startPoint = 0; //按下时鼠标位置
      let startEl = 0; //按下时元素位置
      let y=0;
      list.addEventListener("touchstart",(e)=>{
        let touch = e.changedTouches[0];
        startPoint = touch.clientY;
        startEl = y;
      })
      list.addEventListener("touchmove",(e)=>{
        let touch = e.changedTouches[0];
        let nowPoint = touch.clientY;
        y = startEl + (nowPoint - startPoint);
        list.style.transform = `translate3d(0, ${y}px, 0)`
      })
    </script>
  </body>
</html>
